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Caterpillar® Product Information

Salesgram

For Dealer Sales Personnel

August 1998

Cat® 785C/789C/793CMining TruckIntroduction

Caterpillar mining trucks have become the industry standard for

efficiency, productivity and durability since their introduction in

1984, with over 3,300 trucks shipped. With the introduction of the

C-Series mining trucks — the 793C in late 1996, and the785C/789C models scheduled for late 1998, additional

enhancements have been made to the entire mining truck product

line to help increase machine life and reduce operating costs.

Major enhancements include:

• Cat 3500 B-Series engine

• Redesigned operator’s station

• Integration and improvements to electronic controls

• Improved serviceability



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Designed and manufactured by Caterpillar, the durable and reliable

3500 B-Series engine is the result of proven technology and

performance. The 3500B engine is the heart of the C-Series power

train, providing customers with the lowest cost-per-ton hauling

alternative.

The Cat 3500 B-Series engine offers the following improvements

to the 785 and 789 C-Series mining trucks (these improvementswere made to the 793C when it was introduced in late 1996):

Higher Horsepower Ratings

Horsepower ratings increased by five percent for the 785C

and 789C. Engine power for the 785C increased from 1380 hp

(1029 kW) to 1450 hp (1082 kW), while the 789C increased from

1800 hp (1342 kW) to 1900 hp (1417 kW). Horsepower for the

793C remains unchanged at 2300 hp (1715 kW).

Improved Fuel Injection System

Brake Specific Fuel Consumption has improved 3 to 4 percent as

a result of 22 percent higher fuel injection pressures and shorter

injection cycles. Emissions (NOx) and oil sooting have also been

reduced as a result of these enhancements to the fuel injection

system. Camshafts, cam followers, push rods, rocker arms, and

gear train components were all strengthened in response to these

system changes.

3500 B-Series Engine



Improved Air System

B-Series engines breathe easier due to the following

improvements:

• Improved inlet and exhaust system for streamlined air flow

through the combustion chamber.• Redesigned Separate Circuit Aftercooler System (SCAC).

• Redesigned camshaft for increased valve lift and improved

inlet/exhaust air exchange.

Electronic Control Module (ECM)

The 3500B’s Electronic Control Module (ECM) stores and selects

the appropriate injection timing and air/fuel ratio mixture for any

operational situation by monitoring sensors throughout the engine,

torque converter, transmission, and operator’s control station. The

ECM has been enhanced with the following additional features:• Exhaust temperature derating for extended component life.

• Automatic ether injection protects engine componentry.

• Flash programmable ECM memory for efficient system updates.

• Expanded system sensing, including: coolant flow, rear aftercooler

temperature, engine oil level, engine oil filter pressure/restriction,

turbo exhaust temperature, engine fan speed, air conditioner

compressor pressure and engine crankcase pressure.

• Overspeed monitoring, warning and self-protection.

• Acceleration delay on start-up for extended component life.

• Elevated low idle boosts efficient operating temperatures.

• Air filter restriction deration protects operating components.

• Fan clutch control (optional).

• Oil Renewal System control (optional).

• Pre-lubrication control (optional).

• Radiator Shutter control (optional).

Extended Service Intervals

Service intervals have been extended from 250 to 500 hours for

oil, oil filter, and fuel filter changes, reducing service time andincreasing machine availability.

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Major design improvements have been made to the operator’s

station on all three C-Series trucks to enhance operator comfort,

minimize fatigue, and maximize productivity.

Improved Ergonomics

• Electronically controlled body hoist control provides better

modulation and ease of operation. This hoist control is

hydraulically snubbed for improved comfort.

• Operator’s seat adjustments improved for better comfort.

• New telescopic/tilt steering column provides improved access

and operator comfort.

• Repositioned pedal controls provide easier, more natural actuation.

• New integrated electronic control for intermittent windshield

wiper, washer and turn signal for improved reliability.

• Enhanced instrument layout with backlit rocker switches forimproved visibility.

• Electric horn control mounted on steering wheel for easier access.

Enhanced Operator Comfort

• More powerful heating and air conditioning system provides

enhanced reliability and performance.

• Secondary brake control moved from column lever to floor pedal

for easier access.

• Operator’s seat redesigned and armrests added for improved

comfort.• Increased operator and passenger space provides more leg room

and storage space.

• Power window added to drivers side for ease of operation.

• Cab is radio ready with provision for add-on communication

packages for added versatility.

• Soft grey interior color reduces glare and adds to operators

perception of spaciousness.

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Operator’s Station



Updated Electronic Control Module (ECM)

The Electronic Control Module (ECM) on 3500 B-Series engines

has been enhanced and updated with a number of new features.

(See engine improvements for more details).

A new Electronic Control Module, Transmission and Chassis

Control (TCC), replaces EPTCII and incorporates several new

system improvements. TCC communicates over the CAT Data

Link with the engine ECM to manage engine speed during shifts

for increased clutch life and operator comfort. TCC also controls

body hoist, neutral start, rear axle filtration, and automatic

lubrication functions.

Brake Circuits

Brake circuits have been integrated on all three C-Series trucks

to provide operators with the brake system confidence andperformance they have come to expect from Cat trucks through

the new Integrated Braking Control (IBC) system. This system

incorporates all the advantages of the proven Traction Control

System (TCS), Automatic Retarder Control (ARC) system, and

normal brake control systems into one simplified control module

located in the rear of the operator station.

Vital Information Management System (VIMS)

Caterpillar’s Vital Information Management System (VIMS), an

intelligent machine management tool, provides operators, service

personnel, and managers with information on a wide range of

machine functions. VIMS has been redesigned to relocate sensor

modules in the rear of the operator’s station on all three C-Series

trucks for improved reliability and serviceability.

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Electronic Controls



Circuit Breakers

Circuit breakers have replaced fuses, providing additional

protection of electrical systems and improved serviceability.

Consolidated Electronic ControlsElectronic controls, including: Integrated Braking Control (IBC),

Vital Information Management System (VIMS), and the Transmission

and Chassis Control Module (TCC), have been consolidated for

simpler troubleshooting.

Heating and Air Conditioning System

The heating and air conditioning unit has been relocated to the

front of the operator’s station for easier serviceability, removal

and installation.

Turn Signals

Turn signal and amber lamps have been redesigned and now

feature LED lamps for improved visibility and longer life.

Significant improvements have been made to the 789C cooling

system to improve engine cooling, efficiency and emissions.

Larger Radiator Capacity

The capacity of the 789C cooling system has been expanded

40 percent by increasing the capacity of the radiator from 474 L(125 gal) to 663 L (175 gal).

Shunt Tank

A shunt tank has been added to the cooling system, providing

positive pressure at the coolant pump inlet to prevent cavitation

in high flow conditions.

Larger Fan

The fan diameter increased from 70 to 78 inches, and the number

of blades increased from 8 to 11 for improved cooling efficiency.

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Improved Serviceability

Improved Cooling Systemon 789C



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Metric English

Payload 118-136 130-150

metric tons U.S. tons

Standard Body Capacity:

Struck 57.0 m3 74.0 yd3

Heaped 2:1 (SAE) 78.0 m3 102.0 yd3

Body Capacity with

sideboards 460 mm (18")

Struck 74.0 m3 96.0 yd3

Heaped 2:1 (SAE) 91.0 m3 119.0 yd3

Standard Empty Machine

Weight (approximate) 94 922 kg 209,302 lb

Maximum Gross Vehicle

Machine Weight 249 480 kg 550,000 lb

Engine Cat 3512B EUIRated Speed 1750 rpm

Engine Power:

Gross 1082 kW 1450 hp

Net 1005 kW 1348 hp

Wheel Base 5180 mm 17'0"

Turning Diameter 27.5 m 90'2"

Steering Angle 36 degrees

Fuel Tank Capacity (standard) 1893 L 500 gal

Top Speed 54.8 km/hr 34.0 mphTransmission Speeds 6F - 1R

Brake Surface Area 150 962 cm2 23,405 in2

785C Brief Specifications



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789C Brief Specifications Metric English

Payload 154-177 170-195



Struck 73.0 m3 96.0 yd3

Heaped 2:1 (SAE) 105.0 m3 137.0 yd3

Body Capacity with


Struck 94.0 m3 123.0 yd3

Heaped 2:1 (SAE) 120.0 m3 157.0 yd3






Engine Power:


Net 1335 kW 1791 hp









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Metric English

Payload 218 240



Struck 96.1 m3 125.7 yd3

Heaped 2:1 (SAE) 129.4 m3 169.3 yd3

Body Capacity with


Struck 120.3 m3 157.4 yd3

Heaped 2:1 (SAE) 147.5 m3 193.0 yd3






Engine Power:


Net 1615 kW 2166 hp







793C Brief Specifications



TELQ4459August 1998

www.CAT.com

© 1998 Caterpillar

Printed in U.S.A.

The information contained herein is intended for circulation only to Caterpillar and dealer employees whose duties require knowledge of such reports and is

intended exclusively for their information and training. It may contain unverified analysis and facts observed by various Caterpillar or dealer employees. However,

effort has been made to provide reliable results regarding any information comparing Caterpillar built and competitive machines. Effort has been made to use the

latest available spec sheet and other material in the full understanding that these are subject to change without notice. Any reproduction of this release without

the foregoing explanation is prohibited.

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